One common best practice for enterprise reporting system is one template for all the reports.
In order to use one template follow this steps:
1. Develop one report with all the template item you wish to include at your template.
2. save it on this folder : C:\Program Files\Microsoft Visual Studio 9\Common7\IDE\PrivateAssemblies\ProjectItems\ReportProject
3. There is a file called report.rdl; that is the default one from MS. One caveat, you will have to do this on every machine as the template is on your local PC.